Laminar flow device



Nov. 21, 1967 V BERGEUK ET AL 3,353,564

LAM NAR FLOW DEVIGE 4 Filed oct. 20 1964 2 Sheets-Sheet 1 INVENTOR4 `J'VAN BERGENK H N|EUWENHU...SEN

Nov. 21, 1967 BERGEUK AL 3,353,564

LAMNAR FLOW DEVICE F1ed oct. 20 1964 v 2 sheets-Sheet 2 FIG` 2erforation in Said bame means being less than 0f 5 said tube dia1neter,and the bame means havin a thjckness less than twice the distancebetween adjacent erforations whereby to obtain laminar viscous li uidiiow in w1ich all liquid fractions Will have a uniform residence time inSaid tube.

2. The a aratus as dened in claim l in Which the bame means is a vvirescreen 3. The a aratus as dened in claim 1 in which the bame means is aiiat late 4- The a aratus as denned in claim l ill which theperforations are Tectang11ar,

5. The a aratus as defined in claiIn 1 in which the erforations arecircular.

The a aratus as defined in claim 1 in which the erforations are s uareReferences Ced UNITED STATES PATENTS 10 l,404,6j2 l/1922 Rohnow l384l x3,128,794 4/1964 Boucher etal 13837 3 217 7S0 ll/196S Thomas 1384l

1. A FLOW TUBE FOR ACHIEVING UNIFORM VELOCITY DISTRIBUTION IN VISCOUSLIQUIDS, SAID FLOW TUBE HAVING SUPPORTED THEREIN TRANSVERSELY TO THEAXIS OF FLOW A PLURALITY OF PERFORATED BAFFLE MEANS, EACH OF SAID BAFFLEMEANS EXTENDING COMPLETELY ACROSS SAID FLOW TUBE AND SUCCESSIVE BAFFLEMEANS BEING SPACED AT INTERVALS LESS THAN 1/3 THE INSIDE DIAMETER OFSAID TUBE, THE CHARACTERISTIC WIDTH OF EACH PERFORATION IN SAID BAFFLEMEANS BEING LESS THAN 1/20 OF SAID TUBE DIAMETER, AND THE BAFFLE MEANSHAVING A THICKNESS LESS THAN TWICE THE DISTANCE BETWEEN ADJACENTPERFORATIONS WHEREBY TO OBTAIN LAMINAR VISCOUS LIQUID FLOW IN WHICH ALLLIQUID FRACTIONS WILL HAVE A UNIFORM RESIDENCE TIME IN SAID TUBE.